Members Can Post Anonymously On This Site
Buckley SFB helps DoD monitor, restore monarch migration
-
Similar Topics
-
By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Watersheds on the U.S. Eastern Seaboard will be among the areas most affected by underground saltwater intrusion by the year 2100 due to sea level rise and changes in groundwater supplies, according to a NASA-DOD study. NASA’s Terra satellite captured this image on April 21, 2023. Intrusion of saltwater into coastal groundwater can make water there unusable, damage ecosystems, and corrode infrastructure.
Seawater will infiltrate underground freshwater supplies in about three of every four coastal areas around the world by the year 2100, according to a recent study led by researchers at NASA’s Jet Propulsion Laboratory in Southern California. In addition to making water in some coastal aquifers undrinkable and unusable for irrigation, these changes can harm ecosystems and corrode infrastructure.
Called saltwater intrusion, the phenomenon happens below coastlines, where two masses of water naturally hold each other at bay. Rainfall on land replenishes, or recharges, fresh water in coastal aquifers (underground rock and soil that hold water), which tends to flow below ground toward the ocean. Meanwhile, seawater, backed by the pressure of the ocean, tends to push inland. Although there’s some mixing in the transition zone where the two meet, the balance of opposing forces typically keeps the water fresh on one side and salty on the other.
Now, two impacts of climate change are tipping the scales in favor of salt water. Spurred by planetary warming, sea level rise is causing coastlines to migrate inland and increasing the force pushing salt water landward. At the same time, slower groundwater recharge — due to less rainfall and warmer weather patterns — is weakening the force moving the underground fresh water in some areas.
Worldwide Intrusion
Saltwater intrusion will affect groundwater in about three of every four coastal aquifers around the world by the year 2100, a NASA-DOD study estimates. Saltwater can make groundwater in coastal areas undrinkable and useless for irrigation, as well as harm ecosystems and corrode infrastructure.NASA/JPL-Caltech The study, published in Geophysical Research Letters in November, evaluated more than 60,000 coastal watersheds (land area that channels and drains all the rainfall and snowmelt from a region into a common outlet) around the world, mapping how diminished groundwater recharge and sea level rise will each contribute to saltwater intrusion while estimating what their net effect will be.
Considering the two factors separately, the study’s authors found that by 2100 rising sea levels alone will tend to drive saltwater inland in 82% of coastal watersheds studied. The transition zone in those places would move a relatively modest distance: no more than 656 feet (200 meters) from current positions. Vulnerable areas include low-lying regions such as Southeast Asia, the coast around the Gulf of Mexico, and much of the United States’ Eastern Seaboard.
Meanwhile, slower recharge on its own will tend to cause saltwater intrusion in 45% of the coastal watersheds studied. In these areas, the transition zone would move farther inland than it will from sea level rise — as much as three-quarters of a mile (about 1,200 meters) in some places. The regions to be most affected include the Arabian Peninsula, Western Australia, and Mexico’s Baja California peninsula. In about 42% of coastal watersheds, groundwater recharge will increase, tending to push the transition zone toward the ocean and in some areas overcoming the effect of saltwater intrusion by sea level rise.
All told, due to the combined effects of changes in sea level and groundwater recharge, saltwater intrusion will occur by century’s end in 77% of the coastal watersheds evaluated, according to the study.
Generally, lower rates of groundwater recharge are going to drive how far saltwater intrudes inland, while sea level rise will determine how widespread it is around the world. “Depending on where you are and which one dominates, your management implications might change,” said Kyra Adams, a groundwater scientist at JPL and the paper’s lead author.
For example, if low recharge is the main reason intrusion is happening in one area, officials there might address it by protecting groundwater resources, she said. On the other hand, if the greater concern is that sea level rise will oversaturate an aquifer, officials might divert groundwater.
Global Consistency
Co-funded by NASA and the U.S. Department of Defense (DOD), the study is part of an effort to evaluate how sea level rise will affect the department’s coastal facilities and other infrastructure. It used information on watersheds collected in HydroSHEDS, a database managed by the World Wildlife Fund that uses elevation observations from the NASA Shuttle Radar Topography Mission. To estimate saltwater intrusion distances by 2100, the researchers used a model accounting for groundwater recharge, water table rise, fresh- and saltwater densities, and coastal migration from sea level rise, among other variables.
Study coauthor Ben Hamlington, a climate scientist at JPL and a coleader of NASA’s Sea Level Change Team, said that the global picture is analogous to what researchers see with coastal flooding: “As sea levels rise, there’s an increased risk of flooding everywhere. With saltwater intrusion, we’re seeing that sea level rise is raising the baseline risk for changes in groundwater recharge to become a serious factor.”
A globally consistent framework that captures localized climate impacts is crucial for countries that don’t have the expertise to generate one on their own, he added.
“Those that have the fewest resources are the ones most affected by sea level rise and climate change,” Hamlington said, “so this kind of approach can go a long way.”
News Media Contacts
Andrew Wang / Jane J. Lee
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-354-0307
andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
Share
Details
Last Updated Dec 11, 2024 Related Terms
Shuttle Radar Topography Mission (SRTM) Earth Earth Science Division Jet Propulsion Laboratory Oceans Explore More
5 min read NASA Performs First Aircraft Accident Investigation on Another World
Article 3 hours ago 6 min read NASA’s PACE, US-European SWOT Satellites Offer Combined Look at Ocean
Article 2 days ago 3 min read Leader of NASA’s VERITAS Mission Honored With AGU’s Whipple Award
Article 2 days ago Keep Exploring Discover Related Topics
Missions
Humans in Space
Climate Change
Solar System
View the full article
-
By NASA
3 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The focus of Airspace Technology Demonstration 2 was IADS, a software that coordinates flight schedules between the ramp, tower, terminal, and center control facilities. This visual representation of data helps minimize delays on the ground.NASA / Jim Banke If every commuter drove the same few roads at the same time every day, the traffic would be unbearable. That’s exactly what’s happening in the skies above the nation, known as national airspace (NAS). Multiple flights from different airlines try to use the most direct flight paths, converging on the same airports. With limited runway space, that causes jumbo-sized traffic congestion.
“The majority of uncertainty in the NAS can be attributed to surface operations, and in particular, uncertainty related to when a flight will be available to push back from the gate,” said Jeremy Coupe of NASA’s Ames Research Center in Silicon Valley, California. To help develop a solution, NASA Ames focused on how to improve managing traffic on the ground and scheduling departures.
Holding airplanes at the gate until just before takeoff allows them to run on power supplied by the airport. American Airlines saved millions of gallons of fuel and maintenance costs and tons of harmful emissions by only running engines when arriving at and leaving the gate.NASA Working with the Federal Aviation Administration (FAA), commercial airlines, and airports, NASA developed and tested a new program to manage airport traffic on the ground – the Integrated Arrival, Departure, and Surface (IADS) system. In 2022, the FAA began incorporating this system’s capabilities at 27 of the busiest airports in the country.
Just as a traffic officer can prevent gridlock at a busy intersection, IADS is designed to prevent similar traffic tangles. The first test site for the program development was Charlotte Douglas International Airport in North Carolina, the second-busiest airport on the East Coast with only three runways. About 75% of those are connecting flights.
Before IADS, one challenge the airport faced was a technology mismatch – the airport’s control tower used one software program and ground management used a different one, with no way to integrate them. A phone call was the most common way to notify each other about changes or problems. With approximately 115 aircraft on the ground at any time, a delay in communication could create complications. A plane leaving the gate before being notified of a delay could result in several planes waiting in line at the runway.
“Knowing that you’re going to get where you need to go when the airline says it’s going to deliver you is what people stress about when they’re traveling, especially if they’re trying to make connections in an airport like Charlotte,” said Lee Davis, communications director for the airport. Many factors, including weather, influence timeliness, but making ground operations run predictably is fundamental.
With near real-time data related to on-time departures and delays, airlines can actively address issues related to connections for crew, customers, and cargo. Whether it’s in space or the skies above, NASA innovations continue to make travel more efficient.
Read More Share
Details
Last Updated Nov 27, 2024 Related Terms
Technology Transfer & Spinoffs Spinoffs Technology Transfer Explore More
2 min read Super Insulation Requires Super Materials
NASA researchers helped create an insulation coating that blocks heat and sunlight
Article 1 week ago 2 min read From Mars Rovers to Factory Assembly Lines
NASA-funded AI technology enabling autonomous rovers and drones now keeps an eye on conveyor belts
Article 4 weeks ago 2 min read The View from Space Keeps Getting Better
After 50 years of Landsat, discovery of new commercial and scientific uses is only accelerating
Article 1 month ago Keep Exploring Discover Related Topics
Aeronautics
Air Traffic Management Research
Ames Research Center
Missions
View the full article
-
By Space Force
Under Secretary of the Air Force Melissa Dalton visited Vandenberg Space Force Base, Nov. 14, to meet with Guardians and Airmen and gain a better understanding of the base’s diverse missions.
View the full article
-
By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Coastal locations, such as Drakes Bay on the Point Reyes peninsula in Northern California, are increasingly vulnerable to sea level rise.NOAA/NMFS/WCR/CCO The information will help people who live in coastal areas prepare for impacts caused by rising sea levels.
Earth’s ocean is rising, disrupting livelihoods and infrastructure in coastal communities around the world. Agencies and organizations are working to prepare people as their world changes around them, and NASA information is helping these efforts.
The agency’s global data is now available in the sea level section of the Earth Information Center. NASA developed the global sea level change website in collaboration with the U.S. Department of Defense, the World Bank, the U.S. Department of State, and the United Nations Development Programme.
The site includes information on projected sea level rise through the year 2150 for coastlines around the world, as well as estimates of how much flooding a coastal community or region can expect to see in the next 30 years. The projections come from data collected by NASA and its partners and from computer models of ice sheets and the ocean, as well as the latest sea level assessment from the Intergovernmental Panel on Climate Change, and other sources.
“NASA innovates for the benefit of humanity. Our cutting-edge instruments and data-driven information tools help communities and organizations respond to natural hazards and extreme weather, and inform critical coastal infrastructure planning decisions,” said Karen St. Germain, director of the Earth science division at NASA Headquarters in Washington.
Information to Action
International organizations such as the World Bank will use the data from the global sea level change site for tasks including the creation of Climate Risk Profiles for countries especially vulnerable to sea level rise.
The Defense Department will continue to incorporate sea level rise data into its plans to anticipate and respond to hazards posed to its facilities by the effects of rising oceans. Similarly, the State Department uses the information for activities ranging from disaster preparedness to long-term adaptation planning to supporting partners around the world in related efforts.
“We are at a moment of truth in our fight against the climate crisis. The science is unequivocal and must serve as the bedrock upon which decision-making is built. With many communities around the world already facing severe impacts from sea-level rise, this new resource provides a vital tool to help them protect lives and livelihoods. It also illustrates what is at stake between a 1.5-degree-Celsius world and a current-policies trajectory for all coastal communities worldwide,” said Assistant Secretary-General Selwin Hart, special adviser to the United Nations secretary-general on climate action and just transition.
Rising Faster
NASA-led data analyses have revealed that between 1970 and 2023, 96% of countries with coastlines have experienced sea level rise. The rate of that global rise has also accelerated, more than doubling from 0.08 inches (0.21 centimeters) per year in 1993 to about 0.18 inches (0.45 centimeters) per year in 2023.
As the rate of sea level rise increases, millions of people could face the related effects sooner than previously projected, including larger storm surges, more saltwater intrusion into groundwater, and additional high-tide flood days — also known as nuisance floods or sunny day floods.
“This new platform shows the timing of future floods and the magnitude of rising waters in all coastal countries worldwide, connecting science and physics to impacts on people’s livelihoods and safety,” said Nadya Vinogradova Shiffer, director of the ocean physics program at NASA Headquarters in Washington.
Data released earlier this year found that Pacific Island nations will experience at least 6 inches (15 centimeters) of sea level rise in the next 30 years. The number of high-tide flood days will increase by an order of magnitude for nearly all Pacific Island nations by the 2050s.
“The data is clear: Sea levels are rising around the world, and they’re rising faster and faster,” said Ben Hamlington, a sea level researcher at NASA’s Jet Propulsion Laboratory in Southern California and head of the agency’s sea level change science team. “Having the best information to make decisions about how to plan for rising seas is more crucial than ever.”
To explore the global sea level change site:
https://earth.gov/sealevel
News Media Contacts
Karen Fox / Elizabeth Vlock
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / elizabeth.a.vlock@nasa.gov
Jane J. Lee / Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-0307 / 626-379-6874
jane.j.lee@jpl.nasa.gov / andrew.wang@jpl.nasa.gov
2024-158
Share
Details
Last Updated Nov 13, 2024 Related Terms
Oceans Climate Change Earth Jet Propulsion Laboratory Natural Disasters Explore More
5 min read JPL Workforce Update
Article 17 hours ago 6 min read Inia Soto Ramos, From the Mountains of Puerto Rico to Mountains of NASA Earth Data
Dr. Inia Soto Ramos became fascinated by the mysteries of the ocean while growing up…
Article 22 hours ago 4 min read NASA-developed Technology Supports Ocean Wind Speed Measurements from Commercial Satellite
A science antenna developed with support from NASA’s Earth Science Technology Office (ESTO) is now…
Article 1 day ago Keep Exploring Discover Related Topics
Missions
Humans in Space
Climate Change
Solar System
View the full article
-
By Space Force
Chief Master Sgt. of the Air Force David Flosi visited Vandenberg SFB to emphasize the Air Force and Space Force commitment to ensuring U.S. national security and their role in Great Power Competition.
View the full article
-
-
Check out these Videos
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.